Linked Life Data

18998418

Source:http://linkedlifedata.com/resource/pubmed/id/18998418

Statements in which the resource exists as a subject.
PredicateObject
rdf:type
lifeskim:mentions
pubmed:issue
5-6
pubmed:dateCreated
2008-11-11
pubmed:abstractText
We have confirmed through an enlarged set of 728 species with 10,000 or more compiled codons, and a subset of 237 species with at least 50,000 compiled codons, that the mean values of a previously described index phi [the mean value of the ratio between the relative (G, C) content of Class II and Class I codons, where G and C are guanine and cytosine] decrease monotonically across five large taxa, viz archaea, bacteria, eukaryotes (excluding metazoa), metazoa (excluding vertebrates) and vertebrates. It is proposed that these main taxa diverge successively from an ancestral progenome along lines which have persisted over long periods of time, leading to a primordial non-symmetrical phylogenetic tree. Further divergence, i.e. from eukaryotes to plants, fungi and protozoans, has followed symmetrical branching with approximately equal numbers of replacements and fixations. A statistical analysis of the phi values of twelve distinct proteins, distributed over more than one thousand species belonging to the five main groups, was made to verify whether older taxa have older proteins. This supposition was confirmed for the first four taxa, but it was inconclusive for the last pair, metazoa/vertebrates.
pubmed:language
eng
pubmed:journal
pubmed:citationSubset
IM
pubmed:chemical
pubmed:status
MEDLINE
pubmed:issn
0939-5075
pubmed:author
pubmed:issnType
Print
pubmed:volume
59
pubmed:owner
NLM
pubmed:authorsComplete
Y
pubmed:pagination
454-8
pubmed:dateRevised
2009-11-4
pubmed:meshHeading
pubmed:articleTitle
Do older taxa have older proteins?
pubmed:affiliation
Departamento de Química Fundamental/CCEN, Universidade Federal de Pernambuco, 50670-901, Recife, Pernambuco, Brasil. rferreira100@yahoo.com
pubmed:publicationType
Journal Article, Research Support, Non-U.S. Gov't